What does the Pauline account of the human condition (original sin, need for faith in a godman's sacrifice) have to do with Judaism?

What does Christianity's account have that, say, secular humanism's lacks? Couldn't our inherent "sinfulness" be explained by our animal background, given our having evolved by natural selection? And couldn't the Christian's hope for a perfect future be replaced by secular faith in science, technology, and our social instinct (leading to empathy and compassion)?

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